Code PS1805 / BG1805 / SR1805: ILLEGAL COMMAND
Issue Description & Safety Warning
The Fanuc 0i-D / 0i Mate-D Alarm List has triggered a critical ILLEGAL COMMAND alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Section: CNC alarm list Alarm group: Program/operation, background edit, communication (PS/BG/SR common alarm number) Original alarm number: 1805 [I/O Device] An attempt was made to specify an illegal command during I/O processing on an I/O device. [G30 Reference Position Return] The address P numbers for specifying the 2nd, 3rd, and 4th reference position returns are not 2, 3, and 4. [Single Rotation Dwell] The specified spindle rotation is “0” when single rotation dwell is specified.
Source: Fanuc B-64305EN/03 Appendix A Alarm List
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Fanuc 0i-D / 0i Mate-D Alarm List Alarms
Fanuc controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code PS1805 / BG1805 / SR1805 on the 0i-D / 0i Mate-D Alarm List identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Fanuc's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 769 Fanuc 0i-D / 0i Mate-D Alarm List codes.
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